French Update 8 - Navigation Bar add + cleanup

Just added the navigation bar strings that were missing and i cleaned the rest of the strings that were still there. Btw, i think there is a fault in the english translation ; at line 46, it says "navigation_bar_WIDTH_summary" but in the strings it is "Navigation bar HEIGHT if the bar is along a side" so in the French translation i changed it to what it normally must be so say to me if it's wrong or not. If it isn't, then fix it in the english translation ! Thanks !
Merge pull request #20 from Madikan/patch-9

French Update 8 - Navigation Bar add + cleanup